Case failure - resolved by "refreshing"?
 

Hi there,

I'm experiencing some unusual behaviour with a case I'm running, and I'm not sure what's causing it or if others have experienced it. My case will run fine and gradually converges (I think) but sometimes, usually after a few hours of running, the residuals will suddenly shoot up and the case will fail.

If I restart the case from shortly before it fails (~100 steps or so) it will happily carry on through the point it previously failed with no obvious issues, until it fails again further down the line, where again restarting from shortly before will then allow it to proceed further.

Has anyone experienced this before? How can it behave differently if it's starting from the same point with the same conditions? It makes running the case very frustrating because I can't leave it running by itself for any great length of time without having to "refresh" it to get it to run. A script might be able to automate the refreshing process, but I'm looking for the underlying cause.

Using SFRSimpleFOAM, for a steady state case.

Thanks in advance,

Kieran